Design of raft-pile foundation using combined optimization and finite element approach

Valliappan, S.; Tandjiria, V.; Khalili, Nasser

doi:10.1002/(sici)1096-9853(19990825)23:10<1043::aid-nag40>3.0.co;2-1

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…However, the rules in Table 1 are empirical conclusions without a clear mathematical relationship, which will affect the efficiency of the optimized design. us, other researchers [16,[21][22][23][24][25] have sought to combine an optimization function with numerical calculations to solve this problem and obtain good results.…”

Section: Optimization Methodsmentioning

confidence: 99%

“…An optimized design method based on the stress distribution at the pile top (or BSDPT optimization method for short) is presented in this paper; this method adjusts the pile diameters and pile spacing according to the stress distribution at the pile top to achieve a more uniform settlement and stress distribution at the pile top. During the optimization process, the top loads of the piles will not exceed their ultimate bearing capacities, and the change in the total pile material after optimized design will remain within 1% of the initial design [16], allowing for easy comparison. e piles in this PRF are friction piles, for which the bearing capacity is mainly provided by the friction between the piles and the soil.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Xie

Chi

2019

Advances in Civil Engineering

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Important buildings such as nuclear power plants always require stricter control of differential settlement than ordinary buildings. Therefore, it is necessary to provide an optimized design for the piled raft foundations of important buildings. In this paper, a new optimization method (using different pile diameters and different pile spacing) was proposed for the design of piled raft foundations. This method adjusts the pile diameters and pile spacing according to the stress distribution at the pile top of the initial design to achieve a more uniform settlement of the raft and stress distribution on top of piles, which can solve the differential settlement problems caused by uneven loads of the superstructure. After optimized design, the differential settlement and integral bending moment of the raft decreased more than 64% and 52%, respectively, and the differential stress on top of piles decreased by at least 63%. The new method proposed in this paper could be applied to large-scale piled raft foundations with complex superstructure loads.

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Section: Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Xie

Chi

2019

Advances in Civil Engineering

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“…Foundation optimization presents opportunities to enhance engineering performance by accounting for specific project conditions, with potential savings in material consumption and costs. Earlier studies on the topic include Chow and Thevendran (1987), Truman and Hoback (1992), Horikoshi and Randolph (1998), Valliappan et al (1999), Kim et al (2001), Reul and Randolph (2004), and Leung et al (2010b), etc. While the general features of optimal pile group designs have been discussed by some of these studies, it is difficult to derive an efficient technique to obtain optimum designs for various site conditions, considering the complexity of soil-pile interaction effects and potential stiffness contributions from the adjoining superstructure.…”

Section: Introductionmentioning

confidence: 99%

Superstructure–foundation interaction in multi-objective pile group optimization considering settlement response

et al. 2017

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The full potential of pile optimization has not been realized as the interactions between superstructures and foundations, and the relationships between material usage and foundation performance are rarely investigated. This paper introduces an analysis and optimization approach for pile group and piled raft foundations, which allows coupling of superstructure stiffness with the foundation model, through a condensed matrix representing the flexural characteristics of the superstructure. This coupled approach is implemented within a multi-objective optimization algorithm, capable of providing a series of optimized pile configurations at various amounts of material. The approach is illustrated through two case studies. The first case involves evaluation of the coupled superstructure–foundation analyses against field measurements of a piled raft–supported building in London, UK. The potential benefits of pile optimization are also demonstrated through re-analyses of the foundation by the proposed optimization approach. In the second case, the effects of a soft storey on the superstructure–foundation interactions are investigated. These cases demonstrate the importance of properly considering the superstructure effects, especially when the building consists of stiff components such as concrete shear walls. The proposed approach also allows engineers to make informed decisions on the foundation design, depending on the specific project finances and performance requirements.

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“…The total load of the pile groups involving the contribution of the cap using the numerical simulation has been purposed by (Valliappan, 1999). The pile groups including the effect of the cap transfer the load were then defined as the Raft-pile foundations.…”

Section: Introductionmentioning

confidence: 99%

Floating Raft-Pile Foundations Analysis Using Numerical Simulation

Darjanto¹

2011

JRS-Unand

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The numerical simulation of raft-pile foundations subjected to vertical load is presented in this paper. For comparison study, numerical models of single raft and pile groups are completed. The numerical models are adopting the elastic constitutive law for the materials. The stresses and vertical displacement of the models are observed. The behaviour of the raft-pile foundation compared to the pile-group is then investigated. The results using the same external load show that the raft-pile foundation has smallest displacement compared to the others. In terms of stresses, the raft shows contribution of the load transfer to the underneath soil as well as the piles. Moreover, the behaviour of the raft-pile system appears to be a combination of the pile-group and the single raft. In order to estimate the bearing capacity of the raft-pile system, it is suggested that the contribution of the raft should be included in addition of the piles’. Keywords: raft-pile foundation, soil-structure interaction, floating foundation

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Design of raft-pile foundation using combined optimization and finite element approach

Cited by 13 publications

References 6 publications

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Superstructure–foundation interaction in multi-objective pile group optimization considering settlement response

Floating Raft-Pile Foundations Analysis Using Numerical Simulation

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